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Cobalt is a naturally occurring element found in soil, rocks, animals and plants. There are non radioactive and radioactive forms of cobalt. Non-radioactive cobalt, referred to as stable cobalt, is used to produce metal alloys used in the manufacture of cutting tools, engines in air crafts, magnets and medical applications such as knee and hip joints. Compounds of Cobalt are also used to color paints, glass, and ceramics. Since the alloy containing Cobalt is easier to produce more tungsten rings and tungsten carbide rings containing Cobalt are being sold. These rings that contain Cobalt react with human skin by causing permanent oxidation spots that cannot be polished out or removed. Leaving you will a spotted and ruined piece of jewelry. To avoid this be sure that the tungsten ring you are purchasing is Cobalt free. We are proud to provide the largest and best selection of Cobalt free Tungsten Rings and Tungsten Carbide Rings that are the perfect combination of unbelievable strength with style and comfort.